Question

我使用https://developers.google.com/maps/documentation/javascript/examples/drawing-tools中的这个例子来启用用户选择一个点并让用户在其周围画一个圆圈。

但是，我还需要：

获取用户绘制的圆心的lat / lang。
获得圆的半径。

此代码允许用户绘制多个圆圈，如果可能，我需要限制用户只绘制一个圆圈，如果用户绘制另一个圆圈，则应删除第一个圆圈。


function initialize() {
  var mapOptions = {
    center: new google.maps.LatLng(-34.397, 150.644),
    zoom: 8
  };

var map = new google.maps.Map(document.getElementById('map-canvas'),
    mapOptions);

var drawingManager = new google.maps.drawing.DrawingManager({
    drawingMode: google.maps.drawing.OverlayType.MARKER,
    drawingControl: true,
    drawingControlOptions: {
      position: google.maps.ControlPosition.TOP_CENTER,
      drawingModes: [
        google.maps.drawing.OverlayType.MARKER,
        google.maps.drawing.OverlayType.CIRCLE,
        google.maps.drawing.OverlayType.POLYGON,
        google.maps.drawing.OverlayType.POLYLINE,
        google.maps.drawing.OverlayType.RECTANGLE
      ]
    },
    markerOptions: {
      icon: 'images/beachflag.png'
    },
    circleOptions: {
      fillColor: '#ffff00',
      fillOpacity: 1,
      strokeWeight: 5,
      clickable: false,
      editable: true,
      zIndex: 1
    }
  });
  drawingManager.setMap(map);
}

google.maps.event.addDomListener(window, 'load', initialize);

Answer 1

请参阅http://jsfiddle.net/stevejansen/2HpA6

(function () {
    var circle;

    function initialize() {
        var mapOptions = {
            center: new google.maps.LatLng(-34.397, 150.644),
            zoom: 8
        };


        var map = new google.maps.Map(document.getElementById('map-canvas'),
        mapOptions);

        var drawingManager = new google.maps.drawing.DrawingManager({
            drawingMode: google.maps.drawing.OverlayType.MARKER,
            drawingControl: true,
            drawingControlOptions: {
                position: google.maps.ControlPosition.TOP_CENTER,
                drawingModes: [
                google.maps.drawing.OverlayType.CIRCLE]
            },
            circleOptions: {
                fillColor: '#ffff00',
                fillOpacity: 1,
                strokeWeight: 5,
                clickable: false,
                editable: true,
                zIndex: 1
            }
        });
        drawingManager.setMap(map);
        google.maps.event.addListener(drawingManager, 'circlecomplete', onCircleComplete);
    }

    function onCircleComplete(shape) {
        if (shape == null || (!(shape instanceof google.maps.Circle))) return;

        if (circle != null) {
            circle.setMap(null);
            circle = null;
        }

        circle = shape;
        console.log('radius', circle.getRadius());
        console.log('lat', circle.getCenter().lat());
        console.log('lng', circle.getCenter().lng());
    }

    google.maps.event.addDomListener(window, 'load', initialize);
})();

Answer 2

GoogleMap地图;

 // Add a circle in Sydney
 Circle circle = map.addCircle(new CircleOptions()
     .center(new LatLng(-33.87365, 151.20689))
     .radius(10000)
     .strokeColor(Color.RED)
     .fillColor(Color.BLUE));
<-- to get radius of any location in map, use this code. It shows the radius value from center of map to x and y coordinates.-->
 Toast.makeText(app.getBaseContext(),***[circle.getRadius()][1]***, 
                Toast.LENGTH_SHORT).show();

如何获得用户绘制的圆/圆心的纬度/范围/半径

2 个答案: